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Method for the production of molded bodies from proteins having ionic liquids

A technology of ionic liquid and protein, which is applied in the direction of single-component protein rayon, single-component fibroin artificial filament, textiles and papermaking, etc., which can solve the problem of cost increase

Inactive Publication Date: 2009-04-01
THURINGISCHES INSTITUT FUR TEXTIL & KUNST FORSCHUNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In both methods, process costs are significantly increased due to the necessary dialysis of saline solution and subsequent drying to remove water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Silk fibroin from silkworms cut to a length of 3-5 mm was dispersed in water, crushed at a mixing ratio of 1:20 and allowed to swell for 12 hours. The silk fibroin was dehydrated to 10% by mass by slight extrusion. By dispersing 210 grams of press-wetted (pressfeuchtem) silk fibroin in 61.25 grams of 80% 1-ethyl-3-methyl-imidazolium acetate (EMIMAc) aqueous solution (wherein pre-added 0.5% by mass of gall Propyl acetate / sodium hydroxide as stabilizer) yielded 271.25 g of a slurry which, after being placed in a kneader, under strong shear, a temperature of 80-90° C. and a reduced pressure of 850 to 5 mbar, This resulted in 70 g of a homogeneous solution with complete removal of water. The dissolution time was 160 minutes. The refractive index of a 30% by mass silk fibroin solution is 1.5107 at 50°C. The homogeneity of the solution was monitored with a polarizing microscope on the extracted samples. Rheological measurements gave a decreasing viscosity of 1140 Pas-640 ...

Embodiment 2

[0038] Similar to Example 1, 17.5 g of silk fibroin was dissolved in 65.6 g of 80% 1-butyl-3-methyl-imidazolium acetate (BMIMAc) aqueous solution at pH 7. Converted to 70 g of a homogeneously viscous solution with 25% by mass of silk fibroin. The dissolution time was 180 minutes. The refractive index of silk fibroin solution is 1.5015 at 50°C. The homogeneity of the solution was monitored with a polarizing microscope on the extracted samples. Rheological measurements gave a decreasing viscosity of 1070 Pas-698 Pas at a temperature of 50° C. in the range of a shear gradient of 0.3-4.2 l / s.

[0039] Measurement of the capillary viscosity of a diluted protein solution in 50% lithium bromide aqueous solution after recovery of the silk fibroin with methanol gave an intrinsic viscosity of 22.42 ml / g. The intrinsic viscosity of raw silk fibroin was determined similarly and was 22.57 ml / g.

Embodiment 3

[0041] Similar to Example 1, 14 g of silk fibroin was converted into a silk fibroin having 20% ​​by mass when dissolved in 70 g of 80% 1-ethyl-3-methyl-imidazolium chloride (EMIMCl) aqueous solution. 70 g of a homogeneously viscous solution of silk fibroin. The dissolution time was 140 minutes. The refractive index of the silk fibroin solution is 1.5377 at 50°C. The homogeneity of the solution was monitored with a polarizing microscope on the extracted samples. Rheological measurements give a linearly decreasing viscosity of 977 Pas-574 Pas at a temperature of 50° C. in the range of a shear gradient of 0.3-4.2 l / s.

[0042] Measurement of the capillary viscosity of a diluted protein solution in 50% lithium bromide aqueous solution after recovery of the silk fibroin with methanol gave an intrinsic viscosity of 22.39 ml / g. The intrinsic viscosity of raw silk fibroin was determined similarly and was 22.57 ml / g.

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Abstract

The invention relates to a method for the production of molded bodies from protein having ionic liquids, particularly 1,3-dialkyl imidazolium acetates, or 1,3-dialkyl imidazolium chlorides, as solvents, wherein the protein is dissolved, the solution is molded into fibers, or films, or membranes, the protein is regenerated by means of precipitation in protic solutions, the solvent is separated by means of washing, and the molded bodies are dried.

Description

technical field [0001] The present invention relates to a process for the preparation of shaped bodies from proteins by dissolving the protein in an ionic liquid, in particular 1,3-dialkyl-imidazolium salts, and passing the solution through a shaping method such as spinning Product-oriented processing of yarn (Spinn), casting and blow molding (Blas) methods for the production of shaped bodies such as yarns, filaments, webs (Vliesen), flat films (Folien) or tube films, membranes (Membranen ) and diaphragm (Film). The method according to the invention for producing shaped bodies from proteins is characterized in that the protein is dissolved in an ionic liquid, the solution is shaped into shaped bodies, the protein is recovered by precipitation in a protic solution, the solvent is removed by washing and drying the molded body. [0002] Proteins within the scope of the present invention are natural, high molecular weight fibrous or globular proteins defined as having poor resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F4/02C08J5/18
CPCC08J5/18D01F4/02C08J2389/00D01F4/00
Inventor S·布劳尔B·科森F·梅斯特R-U·鲍尔
Owner THURINGISCHES INSTITUT FUR TEXTIL & KUNST FORSCHUNG
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